/Engine/Source/Runtime/Engine/Classes/Components/SkinnedMeshComponent.h
SkeletalMeshSocket of named socket on the skeletal mesh component, or NULL if not found.
[USkeletalMeshSocket](API\Runtime\Engine\Engine\USkeletalMeshSocket) const * GetSocketInfoByName ( [FName](API\Runtime\Core\UObject\FName) InSocketName, FTransform & OutTransform, int32 & OutBoneIndex ) const